INTERFACING WITH 8086
BY SARAVANAN M
CONTENTS
LCD & LED INTERFACE
KEYBOARD INTERFACE
ALARM INTERFACE
LED INTERFACE
What is LED ?
LED is a Electronic Device which emits light
when the current flows through it. It is widely
used a backlit for Television, Monitor and Small
displays.
Most commonly used components, usually for
displaying pins digital states. Typical uses of LEDs
include alarm devices, timers and confirmation
of user input such as a mouse click or keystroke.
LED INTERFACE
Interfacing LED:
Anode is connected through a
resistor to GND & the Cathode
is connected to the
Microprocessor pin. So when
the Port Pin is HIGH the LED is
OFF & when the Port Pin is LOW
the LED is turned ON.
LED INTERFACE
Pin Assignment and circuit with 8086:
LED INTERFACE
Pin Assignment and circuit with 8086:
LED INTERFACE
ALP LED Interface:
LCD INTERFACE
What is LCD ?
A liquid-crystal display (LCD) is a flat-
panel display or other electronically
modulated optical device that uses
the light-modulating properties of
liquid crystals combined with
polarizers. Liquid crystals do not emit
light directly,
[1]
instead using a
backlight or reflector to produce
images in colour or monochrome.
[2]
This is a 16x2 LCD Display with 16 pins for
Interface
LCD INTERFACE
Pin Configuration
KEYBOARD DISPLAY INTERFACE
Hardware Description :
Keyboard and display is configured
in the encoded mode.
In the encoded mode, a binary
count sequence is put on the scan
lines SL0-SL3.These lines must be
externally decoded to provide the
scan lines for keyboard and display.
A 3 to 8 decoder 74LS138 is provided
for this purpose. The S0-S1 output
lines of this decoder are connected
to the two rows of the keyboard.
And QA0 to QA7 is connected to 7
Segment Display
KEYBOARD DISPLAY INTERFACE
Pin Assignment and Program:
ALARM CONTROLLER
Hardware description and Pin Configuaration:
ALARM CONTROLLER
Alarm Program and GPIO Configuration:
THANK YOU
